I agree with sandcatsecond. They probably don't mean to be rude. Besides, if their response was written (I'm assuming it is) then it might just be hard to convey emotions through written word and they might end up sounding unintentionally harsh. Some professors are just be blunt, or maybe something else was bothering them.
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Aspie score: 153 of 200
NT score: 60 of 200